<template>
  <div class="goods">
    <div class="menu-wrapper" v-el:menu-wrapper>
      <ul>
        <li v-for="item in goods" class="menu-item" :class="{'current':currentIndex===$index}"
            @click="selectMenu($index,$event)">
          <span class="text border-1px">
          <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
            </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" v-el:foods-wrapper>
      <ul>
        <li v-for="item in goods" class="foods-list foods-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px" @click="selectFood(food,$event)">
              <div class="icon">
                <img :src="food.icon" alt="" width="57" height="57">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月供{{food.sellCount}}</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old"
                                                                v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart v-ref:shopcart :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"
              :select-foods="selectFoods"></shopcart>
  </div>
  <food :food="selectedFood" v-ref:food></food>
</template>
<script>
  import BScroll from 'better-scroll'
  import shopcart from 'components/shopcart/shopcart'
  import cartcontrol from 'components/cartcontrol/cartcontrol'
  import food from 'components/food/food'

  const ERR_OK = 0;
  export default {
    name: "goods",
    props: {
      seller: {
        type: Object
      }
    },
    components: {
      food,
      shopcart,
      cartcontrol
    },
    data() {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectedFood:{}
      }
    },
    events: {
      'cart.add'(target) {
        this._drop(target);
      }
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
            return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food);
            }
          })
        })
        return foods;
      }
    },
    created() {
      this.$http.get('/api/goods').then(res => {
        res = res.body;
        if (res.errno === ERR_OK) {
          this.goods = res.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          });
        }
      });
      this.classMap = ['decrease', 'discount', 'guarantee', 'invoice', 'special']
    },
    methods: {
      selectFood(food,event){
        if (!event._constructed) {
          return;
        }
        this.selectedFood=food;
        this.$refs.food.show();
      },
      _drop(target) {
        this.$nextTick(() => {
          this.$refs.shopcart.drop(target);
        })
      },
      selectMenu(index, event) {
        if (!event._constructed) {
          return;
        }
        let foodList = this.$els.foodsWrapper.getElementsByClassName('foods-list-hook');
        let el = foodList[index];
        this.foodsScorll.scrollToElement(el, 300);
      },
      _initScroll() {
        this.menuScorll = new BScroll(this.$els.menuWrapper, {
          click: true
        });
        this.foodsScorll = new BScroll(this.$els.foodsWrapper, {
          click: true,
          probeType: 3
        });
        this.foodsScorll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y))
        })
      },
      _calculateHeight() {
        let foodList = this.$els.foodsWrapper.getElementsByClassName('foods-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          const item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
      }
    }
  }
</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .goods
    display flex
    position absolute
    top 174px
    bottom 40px
    width: 100%
    overflow hidden
    .menu-wrapper
      flex 0 0 80px
      width: 80px
      height: 100%
      background-color: #f3f5f7
      .menu-item
        width: 56px
        height: 54px
        padding 0 12px
        display table
        line-heght 14px
        &.current
          position relative
          margin-top -1px
          background-color: #fff
          font-weight 700
          z-index 10
          .text
            border-none()
        .icon
          display inline-block
          width: 12px
          height: 12px
          vertical-align top
          margin-right 2px
          background-size 12px 12px
          background-repeat no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display table-cell
          font-size 12px
          line-height 14px
          vertical-align middle
          border-1px(rgba(7, 17, 27, .1))
    .foods-wrapper
      flex 1
      .foods-list
        .title
          height: 26px
          line-height 26px
          font-size 12px
          color rgb(147, 153, 159)
          background-color: #f3f5f7
          padding-left 14px
          border-left 1px solid #d9dde1
        .food-item
          display flex
          margin 18px
          padding-bottom 18px
          border-1px(rgba(7, 17, 27, .1))
          &:last-child
            border-none()
            margin-bottom 0
          .icon
            flex 0 0 57px
            margin-right 10px
          .content
            flex 1
            .name
              height: 14px
              line-height 14px
              margin 2px 0 8px 0
              font-size 14px
              font-weight 700
              color: rgb(7, 17, 27)
            .desc, .extra
              font-size 10px
              color rgb(147, 153, 157)
            .desc
              line-height 14px
              margin-bottom 8px
            .extra
              .count
                margin-right 12px
            .price
              line-height 24px
              font-weight 700
              .now
                margin-right 8px
                font-size 14px
                color rgb(240, 20, 20)
              .old
                text-decoration line-through
                font-size 10px
                color rgb(147, 153, 157)
            .cartcontrol-wrapper
              position absolute
              right: 0
              bottom: 12px
</style>
